Old carabiners wanted!

[ledders666]

yeah that makes sence. I got hold of 7 twist lock ones of ebay for £30. was happy with that

[maybelateron]

On 29/10/2021 at 22:42, Dan Maynard said:

If you don't screw up a screwgate biner don't you massively reduce its strength?  You're leaving yourself with an open ended oval, not a continuous ring of steel

With screwgates I screw them up fully, then back off a fraction of a turn, making them easier to undo if loaded significantly. I can't see this being a problem. Same concept as with the valve where your mains water joins the mains, and where it enters the house - crack it back a turn, easier to turn off in 10 years time when there is a crisis.

[Cuttup]

Heightec 25kN steel oval screwgates for £3 new. 1 tonne crane slings are less than a fiver....

 

I wouldn't buy anything second hand at prices like those.

[skc101fc]

Heightec 25kN steel oval screwgates for £3 new. 1 tonne crane slings are less than a fiver....
 
I wouldn't buy anything second hand at prices like those.

I'm not sure I'd buy them new at that price either. If it seems too good to be true, there's often a good reason !

[skc101fc]

With screwgates I screw them up fully, then back off a fraction of a turn, making them easier to undo if loaded significantly. I can't see this being a problem. Same concept as with the valve where your mains water joins the mains, and where it enters the house - crack it back a turn, easier to turn off in 10 years time when there is a crisis.

Spot on there with the water valves, saves a whole heap of stress when you really don't need it. The same thing applies with D and bow shackles for lifting or recovery. Do em up, then back off an touch, especially if there's any chance of overloading/ distorting them.

[Cuttup]

11 minutes ago, skc101fc said:

37 minutes ago, Cuttup said:

Heightec 25kN steel oval screwgates for £3 new. 1 tonne crane slings are less than a fiver....
 
I wouldn't buy anything second hand at prices like those.

I'm not sure I'd buy them new at that price either. If it seems too good to be true, there's often a good reason !

 

	It's true, sometimes things seem too good to be true, but they conform EN362:2004/B. I'm not advertising, just saying. I work for a company that uses similar steel krabs that cost buttons, they're perfectly legal and safe. I'd certainly take that over second hand gear whose history is unknown.

[benedmonds]

On 30/10/2021 at 18:51, ledders666 said:

why is steel important? wear and tear I guess?

 

I would have thought alluminium for its better heat distribution?

One good reason is that you don't mix them up with climbing kit. 

[htb]

52 minutes ago, benedmonds said:

One good reason is that you don't mix them up with climbing kit. 

Also shock loading , Al ones can break, steel tend to distort which is noticeable before using again.

[Cuttup]

On ‎29‎/‎10‎/‎2021 at 21:35, nepia said:

If you don't screw up a screwgate biner don't you massively reduce its strength?  You're leaving yourself with an open ended oval, not a continuous ring of steel

My understanding is that the gate has to be shut to achieve its rated strength, however, the screw (gate)  offers security (i.e. prevents the gate opening) not strength.

 

If you take a snap link carabiner (one that has no locking mechanism) for instance, typical strengths on a aluminium alloy krab would be c. Axial strength 22kN Cross loaded 7kN gate open....5kN.

The 'nose' of the krab locks into the 'female' part creating the link, not the screwgate itself.

If anyone knows any more about this I'd be interested.

 

And back to the original question, how's the second hand krab collecting going?

[Treetom15]

So far so good! Managed to get a load of steel biners which are on their way, slings arrived today so happy days 👌 my current speedline “kit” looked pretty ramshackle so I’m glad it’s getting an update!